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Unformatted text preview: is illuminated with red light ( =771nm), it is observed to have 179 dark fringes. How thick is the hair? 5) The diffraction pattern shown in the figure is produced by passing He-Ne laser light (=632.8nm) through a single slit and viewing the pattern on a screen 1.5m behind the slit. a) What is the width of the slit? b) If monochromatic yellow light of wavelength 591nm is used with this slit instead, will the distance in the figure be greater or less than 15.2cm? 6) White light strikes a diffraction grating with 7400 lines/cm at normal incidence. How many complete visible spectra will be formed on either side of the central maximum? (visible light has between 400nm and 700nm) 7) The asteroid Ida is orbited by its own small moon called Dactyl. If the separation between these two asteroids is 2.5km, what is the maximum distance at which the Hubble Space Telescope (aperture diameter 2.4m) can still resolve them with 550nm light?...
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